try using 360fw-toolbox 4.8 i like it for the benq drives never tryed the jungel flasher yet but i stick to what always work for me may be i will try jungel flasher next time i think i have some guides for using fw toolbox if that would help

iPrep is outdated, and if you want to use this in a 360 dont put on 0800 firmware, that is only for if you want to dump games(which the 1.61 and even some lower version have it if you star the drive half open...)

Anywho get jungleflasher.net their software will do it no iprep needed, no hoops, benq's are very straight forward and easy to mod